Expansion bolt



Oct. 28 1924,

N. J. A. WAHLBERG EXPANSION BOLT Filed March 51 1920 /Vff BY Patented Oct. 28, 1924.

UNITED STATES PATENT OFFICE.

NILVS' J. A. WAHLBERG, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO WEST- INGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENN- SYLVANIA.

EXPANSION BOLT.

Application led March 31, 1920. Serial No. 370,060.

To all whom it 'may concern:

Be it known that I, NiLs J. A. Waremme, a citizen of the United States, and a resident of Wilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Expansion Bolts, of which the following is a specification.

My invention relates to holding devices and particularly to expansion bolts.

One object o my invention is to provide a device of the above indicated character that shall be simple and durable in construction, economical to manufacture and effective in operation.

Another object ofv my invention is to provideean expansion-bolt devioethat shall befreeof cast-metal parts requiring .coring, finishing and other comparatively difficult a0 and ex ensive operations.

Anot er object of my invention is to rovide an expansion-bolt device in whic a pressed-metall expansible sleeve and a frustoconical plug of yi'eldable material shall be so related and frictionallyengaged as to permit the adjustable expansion and contraction on' the sleeve and to hold the sleeve in adjusted position.

In practicing myinvention, I provide an ordinary bolt having a nut or integral vhead thereon. A frusto-conical ,sleeve or plug of yieldable material, such as wood, is mounted on the bolt, with its larger vbasedisposed adjacent to the nut or head. v An elongated sleeve or cylinder of relatively thin material, preferably pressed metal, is disposed on the bolt with vone end perimeter engaging the plu at a position intermediate the ends of the atter and has a longitudinal slot or slots extending through its walls from the lug to a osition intermediatethe ends ol the cylin er. An inwardly projecting annular flange at the other end of the cylinder serves to position the c linder symmetrically with 45. res ect to the bo t.

igre 1 of the accompanying drawings is a side elevational view of an expansion-bolt device embodying my invention; and Fig.

2 is alongitudinal sectional view of the'device shown in Fig. 1. v

A. bolt 1, having an integral head or a nut 2 thereon, is embraced, near the head, by a frusto-conical plug o'r wedge member 3, preferably of wood, disposed with its larger base adjacent to the head. A cyhndrical sleeve 4, preferably of relatively thin pressed metal, having a serrated or corrugated portion 5, a slot 4or slots 6 extending from one end to a position intermediate its ends and an inwardly-projecting annular Hange 7 at its other end, is disposed on the bolt with its slotted-end perimeter embracing an intermediate portion of the plug 3.

When the plu or wedge member 3 is forced into the s eeve 4, the latter will lexpand to `engage its corrugated portion 5 against the sides of an apertured support or member (Inet shown) in which the device may be p aced. When thus expanded, the end-'edges of the sleeve 4 are slightly depressed into the plug or wedge member 3 to effect a firm gripping relation therewith.

The device is constructed of easily workable material of sim le forms, thus reducing the expense and la or connected with its manufacture, is rugged and durable in construction and effective in operation.

While I have shown and described a particular form of my invention, changes may be effected therein without departing from the spirit and scope thereof, as set forth in the appended claims.

I claim as my invention:

1. An expansion-bolt device comprising a bolt, an expansible pressed metal sleeve embracing the bolt and provided with annular corrugations forming exterior and interior gripping surfaces, and a frusto-conical plug embracing the bolt inside the sleeve an movable with respect to the latter.

2. An 'expansion-bolt device comprisin a headed bolt, a hollow frusto-conical ug embracing the bolt adjacent to the heaii of the bolt, Iand a longitudinally slotted ressed metal sleeveembracing. the bolt and tlie'plug and provided with an annular corrugation forming exterior and interior gripping surfaces.

3. An expansion-bolt device comprising a headed bolt a hollow frusto-comcal p u embracing the bolt adjacent to the head o the bolt, and an expansible pressedmetal sleeve surroundingl the bolt and having one end'perimeterl engaging and embracing the plug, said sleeve' having interior corrugations forming a series `of integral frusto. conical grippm surfaces.

4. An expansion-bolt device comprising a headed bolt, a hollow frustofconical embracing the bolt adjacent to the h o iin the bolt, a pressed metal sleeve surrounding the bolt having one end perimeter engaging and embracing the plug, said sleeve having a longitudinal slot from said end to a position a intermediate its ends and provided with exterior and interior corrugations extending substantially around the sleeve.

5. An expansion-bolt device comprising a headed bolt, an expansible member support- 10 ed by the boltl and a member of yieldable NILS J. A. WAHLBERG. 

